HALF-LIFE (SECTION 11.5) 11.54 What does it mean when we say that strontium-90,

Question

HALF-LIFE (SECTION 11.5) 11.54 What does it mean when we say that strontium-90, a waste 11.55 How many half lives must pass for the mass of a radioactive (a) What i (b) What i If a radiati what dista to below 2 product of nuclear power plants, has a half-life of 28.8 years? 11.69 sample to decrease to 35% of the original mass? To 10%? Selenium-75, a B emitter with a half-life of 120 days, is 11.56 used medically for pancreas scans CONCEPTUAL (a) Approximately how long would it take for a 0.050 g sample of selenium-75 to decrease to 0.010 g? 11.70 Film bad specific t cludes a a plastic monito to B-rad (b) Approximately how much selenium-75 would remain from a 0.050 g sample that has been stored for one year? (Hint: How many half-lives are in one year?) 11.57 Approximately how long would it take a sample of selenium-75 to lose 75% of its radioactivity? To lose 99%? (See Problem 11.56.) 11.58 The half-life of mercury-197 is 64.1 hours. If a patient 11.71 Some undergoing a kidney scan is given 5.0 ng of mercury-197 rent va how much will remain after 7 days? After 30 days? 11.72 Harmf 11.59 Gold-198 a & amitt

Explanation / Answer

Solution :-

The half-life of strontium-90 is 28.8 years. It means it takes 28.8 years to decay to half of its initial amount.

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